Heineich ujhely



' UNITED STATES PATENT OFFICE.

PROCESS OF DECOLORIZING AND DEODORIZING HEAVY MINERAL OILS.

SPECIFICATION forming part of Letters Patent No. 289,788, dated December4, 1883. Application filed February 24, 1883. (No specimens.) I

To all whom it may concern Be it known that I, HEINRICH UJHELY, a

subject of Austria-Hungary, residing at Vienna, in the Province ofNether Austria, in the Empire of Austria-Hungary, have invented certainnew and useful Improvements in Process of Decolorizing and DeodorizingHeavy Mineral Oils 5 and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to. an improved process of decolorizing anddeodorizing heavy mineral oils. I call heavy mineral oils such oils thespecific gravity of which is equal to or exceeds .7, no matter whatsource they are derived from.

In order to decolorize and deodorize any heavy mineral oil it is firstdissolved in any light hydrocarbon, the boiling-point of which is belowor at least not much above 100 Celsius. The quantity of lighthydrocarbon should be preferably larger than necessary for th orough- 1ydissolving the heavy oil. This solution is boiledwith a suitablequantity of the insoluble residuum obtained in the manufacture offerro-cyanide of potassium, which residuum is known as blackening orblacking, (German schwarze); and it consists essentially of animalcharcoal with traces of iron, sulphuret of iron, silicates of potassium,and sodium, 850., or with a mixture of these said ani mal charcoals. Noaccurate proportion can be given as to the quantity of the saidcarbonaceous substances to be added to the hydrocarbon solution, as thisproportion must be varied in accordance with the quantity of impurities7 contained in the mineral oil. This boiling may be effected underpressure or by employ- 4o ing a cooler by which the evaporated parts ofthe oil are condensed and again conducted into the boiling-vessel, or bymeans of any other apparatus which permits the boiling of a certainquantity of volatile liquids without di- 5 minishing them byevaporation. The solution, which by this process has been decolored, isnow separated from the charcoal by filtration, and finally submitted todistillation in P order to separate from the heavy mineraloil 50 or oilsthe light hydrocarbons which have been employed as solvents. The saidprocess oi distillation is carried on to that point only until all lighthydrocarbons are evaporated, after which the heavy mineral oils remainin 55 I the distilling-vessel in a perfectly. colorless and odorlessstate.

What I claim is- The process of decolorizing and deodorizing heavymineral oils, which consists in dis 6o solving them in light hydrocarbonoils, adding to the solution the insoluble residuum ob tained in themanufacture of ferro-cyanide of potassium, as described, boiling themixture, filtering the same, and finally distilling from the filtratethe hydrocarbon solvent, all substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

HEINRICH UJHELY.

WVitnesses:

WILLIAM HUNING, J AMES RILEY WEAVER.

